Malicious PDF — malware analysis report

Static analysis result for SHA-256 92fa197eb3b5c261…

MALICIOUS

PDF

76.8 KB Created: 2021-09-02 19:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 78ab71dafb556347c5310055f985451d SHA-1: aaae282384f083c52c0cda4d79eede7290c6e220 SHA-256: 92fa197eb3b5c2615c11c5ae34bae6ccfc4a652afd0a1cb9b71a6987ae4458bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to potentially malicious content. The presence of these links suggests an attempt to lure users into clicking them, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160912a062fe25---dexupexaxerafapavebanogik.pdf In PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/guwinawofoxonudir.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089a8ac7adfc---fetutofotizofivapinulaj.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/50160187354.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/22641204323.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/1b9078b0badeb4eeaab690da1035cf7a/dexatojuniroseguzom.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d19ea572d1---4989695486.pdfIn PDF document text
    • https://isleo.com/i_photos/file/80547144.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/91879115832.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/78457382636.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161124e0b149a3---381177147.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9312983723---8441860064.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/ce8a7196f331da366b30b233ab6af57d/69342285091.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/dae971007feb0ce9bbb75a1657e70df8/74370158960.pdfIn PDF document text
    • https://ccskin.com/geektic/files/tumaxa.pdfIn PDF document text
    • http://renovator.cz/files/file/gawafudefixifepolovipij.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4263989497---nizaxazilikof.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/mibuxewesofutilu.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071be8080f36---pijuj.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/wedunuwotepizapok.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/91319490977.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/jinulamariwagidajuvejuva.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/kuxij.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/04032e128a3a046ed4f0c9abbf37ecec/81392176345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+convert+adobe+reader+pdf+to+excel+without+converterPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AE 17724 bytes
SHA-256: b9c26c929287a26b93bb8ab30db5a51fcf846106b7a59a7105f718d8386b56ff
font_01_sfnt_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C38 11032 bytes
SHA-256: 71cae8c5edc192f1833d9623eb520652cc07199d67dcfe4715d0ee01614fd3c2